Cylinder pressure based combustion phase optimization and control in spark-ignited engines
Efficiency and emissions of spark-ignited engines are significantly affected by combustion phase which can usually be indicated by crank angle of 50% mass burnt (CA50). Managing combustion phase at the optimal value at which the maximal efficiency can be achieved is a challenging issue due to the cyclic variations of combustion process. This paper addresses this issue in two loops: CA50 set-point optimization (outer loop) and set-point tracking (inner loop) by controlling spark advance (SA). Extremum seeking approach maximizing thermal efficiency is employed in the CA50 set-point optimization. A proportionalintegral (PI) controller is adopted to make the moving average value of CA50 tracking the optimal CA50 set-point determined in the outer loop. Moreover, in order to obtain fast responses at steady and transient operations, feed-forward maps are designed for extremum seeking controller and PI controller, respectively. Finally, experimental validations are conducted on a six-cylinder gasoline at steady and transient operations to show the effectiveness of proposed control scheme.
KeywordsCombustion phase optimization extremum seeking feedback control cylinder pressure spark-ignited engine
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- E. Corti, C. Forte, G. Mancini, et al. Automatic combustion phase calibration with extremum seeking approach. Journal of Engineering for Gas Turbines and Power, 2014, 136(9): DOI 10.1115/1.4027188.Google Scholar
- E. Corti, C. Forte. A statistical approach to spark advance mapping. Journal of Engineering for Gas Turbines and Power, 2010, 132(8): DOI 10.1115/1.4000294.Google Scholar
- E. Pipitone. A comparison between combustion phase indicators for optimal spark timing. Journal of Engineering for Gas Turbines and Power, 2008, 130(5): DOI 10.1115/1.2939012.Google Scholar
- E. Pipitone. Spark ignition feedback control by means of combustion phase indicators on steady and transient operation. Journal of Dynamic Systems, Measurement, and Control, 2014, 136(5): DOI 10.1115/1.4026966.Google Scholar